[Elecraft] Re:K2/100 Frequency Stability

Mon Dec 16 19:38:31 2002

Hi

Well it makes sense that you guys would have tried every way of cooling the
K2/100 and found the best arrangement. I don't know if the K2's that are
drifting with heating of the KPA100 have all of the B mods that address
drifting or not. It's just there has been some discussion lately and I was
thinking out loud. That sometimes gets me into trouble. ;-)

Don Brown
KD5NDB

----- Original Message -----
From: "Eric Swartz WA6HHQ - Elecraft" <[email protected]>
To: "Don Brown" <[email protected]>
Cc: "Wallace, Andy" <[email protected]>; <[email protected]>
Sent: Monday, December 16, 2002 5:32 PM
Subject: Re: [Elecraft] Re:K2/100 Frequency Stability

> Please don't do this as it will draw HOT air across the heatsink fins into
> the cabinet. I designed the heat flow to pull cool air into the case from
> the rear and for it to exit through the front top heatsink fins and the
> other case openings.
>
> As I noted previously, the most efficient method of adding additional
> cooling is to move air across the heat sink fins. We have used this for
> several DXpeditions running high TX duty cycles in very hot environments
and
> it runs the heatsink much cooler, resulting in cooler interior
temperatures.
>
> If you want to add auxiliary cooling, a 3" 12V fan running at half speed
> placed on top of the heatsink (halfway to the rear and 2/3 to the right)
> pulling air up and away from the heatsink works well. Putting rubber stick
> on feet on the bottom of the fan will keep it in place and space it
> correctly for proper air flow.
>
> 73, Eric  WA6HHQ
> ================
>
> Don Brown wrote:
> >
> > Hi
> >
> > Maybe someone should try reversing the fan to see if pulling the hot air
out
> > of the K2 would work better. It would make sense that if cool air was
pulled
> > in through the slots in the bottom and over the RF board before it was
> > heated would keep the VFO cooler and at a more even temperature.
> >
> > Don Brown
> >
> > ----- Original Message -----
> > From: "Wallace, Andy" <[email protected]>
> > To: <[email protected]>
> > Sent: Monday, December 16, 2002 3:03 PM
> > Subject: RE: [Elecraft] Re:K2/100 Frequency Stability
> >
> > > > -----Original Message-----
> > > > From: Don Brown [mailto:[email protected]]
> > > >
> > > > The K2 already has several places the air can flow out of.
> > > > The air is drawn in by the fan and can exit
> > >
> > > So wouldn't this circulate hot KPA100 air from the underside
> > > of the KPA into the K2? It would make more sense to me to have the fan
> > > exhaust from the K2. Cool air would be drawn in the various
> > > places and out the fan, keeping the overall temperature down.
> > >
> > > Not having either K2 or KPA100 yet, I could be wrong!
> > >
> > > -Andy
> > >
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